Thailand. (Taiwan-First Flight). 1939. First Flight envelope addressed to Taihuku, Formosa bearing Siam SG 235, 25s blue tied by Bangkok date stamp '4th Feb 1939' endorsed 'Japan Aviation Company / First Flight Bangkok - Taihuku' with Taihoku/ Nippon arrival on reverse '5/2'. Rare flight to Formosa only thirty covers carried.
'Goodwill Mission' return flight Bangkok - Tokyo by Japan Aviation Co. The Bangkok - Taihoku stage, 4th February 1939.